Rolling shears



(No Model.)

L. 0. THOMPSON. ROLLING SHEARS.

No. 541,463. Patented June 25, 1895.

m: N o'ams vzrsns In, "manna. WASHINGTON. n. c.

' UNITE STATES -ATENT Fries.

LYNN o. THOMPSON, or DARLINGTON, INDIANA.

ROLLING SHEARS.

SPECIFICATION forming part of Letters Patent N0. 541,463, dated June 25,1895. Application filed January 19, 1895. Serial No. 535,556. (Nomodel.)

To. all whom it may concern:

Be it known that I, LYNN O. THOMPSON, a

citizen of the United States, residing at Darvention will appear in thefollowing description and the novel features thereof will beparticularly pointed out in the appended claims.

In the drawings, Figure l is a side view of a device constructed inaccordance with my invention. Fig. 2 is a similar view with. the sideplate removed. Fig. 3 is a transverse section on the line 3 3 of Fig. 1.Fig. 4 is a detail view of the cap'plate detached. Fig. 5 is ahorizontal section on the line. 5 5 of Fig. 1.

Similar numerals ofreference indicate corresponding parts in all thefigures of the drawings. I

1 designates a frame or casing provided at its lower edge withantifriction supporting rolls 2 adapted to traverse the surface of atable or floor during the operation of the device. The front portion ofthe frame is provided with an opening 3 to form upper and lower jaws 4and 5 between which the material to be cut is passed, and in rear ofthis opening the upper and lower portions of the frame areconnected bymeans of a thin vertical web 6, sharpened or reduced at its front end toavoid interference or unnecessary friction with the severed edges of thematerial cut.

Segmental cavities 7 and 8 are formed in the upper and lower jaws of theframe, in the former of which is arranged a cutting disk 9 and in theother a smaller cutting disk 10, said disks having their inner or facingsides concaved to insure proper contact of the cutting edges, and causesaid edges to be selfsharpening by said contact. The open sides of thesecavities are closed by a. cap-plate faces of the disks and hold them inyielding contact at their cutting edges. These springs are secured tothe frame, and if their tension is equal the disks are held with theircutting edges opposite the front end of the web 6, but in order toprevent lateral displacement in case onespring is stronger than theother, I employ limiting set screws 17, which are threaded in the casingand bear, respectively, against the inner or concave surfaces of thedisks. This limits the inward movement of the disk which is actuated bythe stronger spring and allows the other spring to hold its disk in theproper position.

The upper portion of the frame is constructed with ears 18 between whichis arranged achandle 19 whereby the shears may be operated. 1

.In operation the rollers'2 are arranged upon a floor or table. The edgeof the material to be cut is'inserted betweenthe jaws 4 and 5, and theapparatus is'pushed forward to cause the co-acting disk-cutters to severthe same upon a line regulated by the direction of movement. The severededges pass upon opposite sides of the thin web 6, which does obstructionto their passage.

It will be seen that the cutting devices are disposed in a verticalplane with and between the front and rear supporting rolls wherebyforward and rearward rocking movement of the shears is avoided duringoperation, and the operator is enabled to guide the shearsin a straightline with facility. In case it is necessary to out upon a curved. line,the shears may be tipped forward upon the front roller thereby throwingsaid roller approximately under the cutting disks.

It will be seen, furthermore, that the handle 19 is arranged at aninclination, forward and upward, to the plane of operation of theshears, or a plane embracing the axis of the not cause them to curl anddoes not offer any supporting rollers, the rear arm 18 which supportsone end of the handle being approximately vertically over the rearsupporting roller, and hence in operation the pressure upon the handleis both downward and forward, and is approximately in a line connectingthe center of the handle, the cutting disks and the front roller. Thisgives the operator a firm hold upon the shears and enables him toadvance and guide the same with accuracy and power without unnecessaryexertion.

The front edge of the web 6 is inclined rearwardly toward its lower endwhereby as the severed edges of a sheet of material pass upon oppositesides of the web a slight downward pressure is exerted thereon, andhence it there is any tendency to curl at the edges the curling isdownward rather than upward, and hence the sheet of material is causedto flatten out in rear of the shears instead of rolling laterally, aswould be the case if the edges were turned upward. The upward deflectionof the severed edges of a sheet of material is liable to render itdifficult to guide the shears for the reason that it causes an unequalstrain upon the sides or portions of the sheet at or near theintersecting point of the cutting edges of the disks.

It will be understood that in practice, various changes in the form,proportion, and the minor details of construction may be resorted towithout departing from the spirit or sacrificing any of the advantagesof this inveniion.

Having described my invention, I claim- 1. The combination of aframehaving separated upper and lower jaws provided with cavities, andupwardly extending front and rear arms between which is arranged ahandle inclined upward toward its front end, cuttingdisks mounted insaid cavities and intersecting between the jaws, and front and rearsupporting rolls arranged, respectively,

in advance and in rear of the cutting disks and approximately in thevertical plane of their contiguous side surfaces, the rear sup portingroll being approximately under the arm supporting the rear end of thehandle whereby downward and forward pressure may be exertedapproximately in a line connecting the center of the handle with thefront supporting roll, substantially as specified.

2. The combination of a frame having up per and lower jaws, a dividingweb arranged in the plane of the frame and having a reduced or sharpenedfront edge which is inclined rearwardly toward its lower end, and ahandle by which the frame may be advanced, and cutting disks mounted incavities in said jaws and intersecting between the same and in advanceof the reduced edge of the dividing web with their contiguous surfacesin the plane of said web, whereby the severed edges of a sheet ofmaterial are separated by the dividing web and are turned or curleddownwardly by contact with the rearwardly and downwardly inclined frontedge thereof, substantially as specified.

3. The combination with a frame having upper and lower separated jaws,provided with cavities of upper and lower co-acting disks arrangedrespectively in the cavities, tension springs secured to the frame andbearing against the outer surfaces of the cutters, and set-screwsmounted in the frame and impinging against the inner surfaces of thedisks to limit the inward movement of the same due to the tension ofsaid springs, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto aiiiixedmy signature in in the presence of two witnesses.

LYNN O. THOMPSON. Vitnesses:

SILAS L. Bownns, ROBERT '1. M. GIFFIN.

